DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1757
|Date of introduction:||1981||Display technology:||LCD|
|New price:||Display size:||8|
|Size:|| 4.0" x 2.4" x 0.25"
101 x 61 x 6.5 mm≥
|Weight:||1.7 ounces, 48 grams||Serial No:||7468115|
|Batteries:||2*LR54||Date of manufacture:||1983|
|AC-Adapter:||Origin of manufacture:||Taiwan|
|Precision:||8||Integrated circuits:||Sharp LI3321|
|Program steps:||Courtesy of:||Fabrizio Corpetti|
(EU: 2.8M Bytes)
(EU: 1.3M Bytes)
TI-1757 "Melody Card" added to the similar TI-1755
the capabilities to play own melodies or store up to 8 notes in its memory. This
TI-1757 was soon replaced with the TI-1757 II
"Melody Calculator", adding more music in the same package.
Dismantling this TI-1757 manufactured in or around 1982 by a non-disclosed OEM (Original Equipment Manufacturer) in Taiwan reveals a clean design centered around a Sharp LI3321 single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by two LR54 (LR1130) batteries.
Inspecting the PCB of this TI-1757 calculator brought our attention to a small mark reading ML61-2, we spotted a similar PCB-Mark MK65-A already with the TI-1755 and its twin TI-1756. We are almost positive that the TI-1757 was manufactured by Inventa Electronics Corporation of Taipei, Taiwan. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
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© Joerg Woerner, November 25, 2022. No reprints without written permission.